How can I build multiple binaries with Cargo?

Another format could be to replicate what the Crates.io source code has done, if you have a massive project, something like:

Main Library in src, with a Bin folder with your executables. Then make calls to your main library crate from your executables.

That way you library is centralized so easier to find things as it's cached.

You can specify multiple binaries using [[bin]], as mentioned here:

[[bin]]
name = "daemon"
path = "src/daemon/bin/main.rs"

[[bin]]
name = "client"
path = "src/client/bin/main.rs"

Tip: If you instead put these files in src/bin/daemon.rs and src/bin/client.rs, you'll get two executables named daemon and client as Cargo compiles all files in src/bin into executables with the same name automatically. You need to specify names and paths like in the snippet above only if you don't follow this convention.

Another way is to use the workspace feature. This will provide more flexibility due to the fact that we can have more than one library. Example project structure:

.
├── Cargo.toml
├── cli
│   ├── Cargo.toml
│   └── src
│       └── main.rs
├── core
│   ├── Cargo.toml
│   └── src
│       └── lib.rs
├── daemon
│   ├── Cargo.toml
│   └── src
│       └── main.rs
├── gui
│   ├── Cargo.toml
│   └── src
│       └── main.rs
└── rpc
    ├── Cargo.toml
    └── src
        └── lib.rs

Contents of the root Cargo.toml:

[workspace]
members = ["cli", "core", "daemon", "gui", "rpc"]